Can CMB data constrain the inflationary field range?

Juan Garcia-Bellido*, Diederik Roest, Marco Scalisi, Ivonne Zavala

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

19 Citaten (Scopus)
93 Downloads (Pure)


We study to what extent the spectral index ns and the tensor-to-scalar ratio r determine the field excursion Delta phi during inflation. We analyse the possible degeneracy of Delta phi by comparing three broad classes of inflationary models, with different dependence on the number of e-foldings N, to benchmark models of chaotic inflation with monomial potentials. The classes discussed cover a large set of inflationary single field models. We find that the field range is not uniquely determined for any value of (ns, r); one can have the same predictions as chaotic inflation and a very different Delta phi. Intriguingly, we find that the field range cannot exceed an upper bound that appears in different classes of models. Finally, Delta phi can even become sub-Planckian, but this requires to go beyond the single-field slow-roll paradigm.

Originele taal-2English
Aantal pagina's16
TijdschriftJournal of Cosmology and Astroparticle Physics
Nummer van het tijdschrift9
StatusPublished - 3-sep-2014

Citeer dit